[HELP] OPUS 7.1 audio problem (?)

[shazzla]

Greetings !

I did an x265 conversion with OPUS 7.1 and OPUS 5.1 audio.
The resulting .mkv heavily stutters with the 7.1 OPUS audio. If i switch to 5.1 ,everythings fine.
With 7.1 audio ,CPU usage is ~30 %...
No matter what player i use. Never experienced like this before....
Any idea guys ?

Some infos :

Hybrid : V2024.06.09.1
CPU : i5-6600
RAM : Much more than enough
Audio 1 source : TrueHD/Atmos Audio English 4944 kbps 7.1+11 objects / 48 kHz / 4304 kbps
Audio 2 source : Dolby Digital Audio 640 kbps 5.1 / 48 kHz / 640 kbps
Any errors : Nope

Sample : Cant upload ,due to copyright laws.

Other infos from player :

      Format : Matroska
      Format version : Version 4
      File size : 2.15 GiB
      Duration : 2 h 10 min
      Overall bit rate : 2 361 kb/s
      Encoded date : UTC 2024-06-17 05:35:38
      Writing application : mkvmerge v83.0 ('Circle Of Friends') 64-bit
      Writing library : libebml v1.4.5 + libmatroska v1.7.1
      Encoding Gui : Hybrid 2024.05.11.1
  Video #1
      ID : 1
      Format : HEVC
      Format/Info : High Efficiency Video Coding
      Format profile : Main 10@L4.1@High
      Codec ID : V_MPEGH/ISO/HEVC
      Duration : 2 h 10 min
      Bit rate : 1 873 kb/s
      Width : 1 920 pixels
      Height : 1 080 pixels
      Display aspect ratio : 16:9
      Frame rate mode : Constant
      Frame rate : 23.976 (24000/1001) FPS
      Color space : YUV
      Chroma subsampling : 4:2:0
      Bit depth : 10 bits
      Bits/(Pixel*Frame) : 0.038
      Stream size : 1.70 GiB (79%)
      Writing library : x265 3.6+13-9a75b5947:[Windows][GCC 13.2.0][64 bit] 10bit
      Default : Yes
      Forced : Yes
      Color range : Limited
      Color primaries : BT.2020
      Transfer characteristics : PQ
      Matrix coefficients : BT.2020 non-constant
  Audio #2
      ID : 2
      Format : Opus
      Codec ID : A_OPUS
      Duration : 2 h 10 min
      Bit rate : 245 kb/s
      Channel(s) : 8 channels
      Channel layout : L
      Sampling rate : 48.0 kHz
      Frame rate : 50.000 FPS (960 SPF)
      Compression mode : Lossy
      Stream size : 229 MiB (10%)
      Writing library : opusenc from opus-tools 0.2-34-g98f3ddc
      Language : English
      Default : Yes
      Forced : No
      Comment : Processed by SoX
      ENCODER_OPTIONS : --bitrate 352 --comp 10 --framesize 20 --expect-loss 0 --max-delay 1000
  Audio #3
      ID : 3
      Format : Opus
      Codec ID : A_OPUS
      Duration : 2 h 10 min
      Bit rate : 239 kb/s
      Channel(s) : 6 channels
      Channel layout : L R C Ls Rs Cb LFE
      Sampling rate : 48.0 kHz
      Frame rate : 50.000 FPS (960 SPF)
      Compression mode : Lossy
      Delay relative to video : 11 ms
      Stream size : 223 MiB (10%)
      Writing library : opusenc from opus-tools 0.2-34-g98f3ddc
      Language : Hungarian
      Default : No
      Forced : No
      Comment : Processed by SoX
      ENCODER_OPTIONS : --bitrate 256 --comp 10 --framesize 20 --expect-loss 0 --max-delay 1000


And thats all.... ( At the moment, I'm away from my PC.)

[Selur]

No clue, can't reproduce the problem here.
Did two test encodes with 7.1 audio and the output plays fine, no stuttering.

F:\Hybrid\64bit>MediaInfo.exe "g:\Output\T2 DTS-HD 7.1.mkv"
General
Unique ID                                : 94988206616419280386751504160944266073 (0x4776102A820B41B36F1C9CCFA7179B59)
Complete name                            : g:\Output\T2 DTS-HD 7.1.mkv
Format                                   : Matroska
Format version                           : Version 4
File size                                : 55.8 MiB
Duration                                 : 25 s 575 ms
Overall bit rate                         : 18.3 Mb/s
Frame rate                               : 23.976 FPS
Encoded date                             : 2024-07-25 18:18:08 UTC
Writing application                      : mkvmerge v86.0 ('Winter') 64-bit
Writing library                          : libebml v1.4.5 + libmatroska v1.7.1 / Lavf61.5.101
Encoding Gui                             : Hybrid 2024.07.24.1

Video
ID                                       : 1
Format                                   : VC-1
Format profile                           : Advanced@L3
Codec ID                                 : V_MS/VFW/FOURCC / WVC1
Codec ID/Hint                            : Microsoft
Duration                                 : 25 s 568 ms
Bit rate                                 : 17.9 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 (23976/1000) FPS
Original frame rate                      : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Compression mode                         : Lossy
Bits/(Pixel*Frame)                       : 0.360
Stream size                              : 54.6 MiB (98%)
Default                                  : No
Forced                                   : No

Audio
ID                                       : 2
Format                                   : Opus
Codec ID                                 : A_OPUS
Duration                                 : 25 s 575 ms
Bit rate                                 : 409 kb/s
Channel(s)                               : 8 channels
Channel layout                           : L R C Ls Rs Lb Rb LFE
Sampling rate                            : 48.0 kHz
Frame rate                               : 50.010 FPS (960 SPF)
Compression mode                         : Lossy
Stream size                              : 1.25 MiB (2%)
Writing library                          : opusenc from opus-tools 0.2-34-g98f3ddc
Language                                 : English
Default                                  : Yes
Forced                                   : No
Comment                                  : Processed by SoX
ENCODER_OPTIONS                          : --bitrate 512 --comp 10 --framesize 20 --expect-loss 0 --max-delay 1000

F:\Hybrid\64bit>MediaInfo.exe "g:\Output\Tron Legacy Sample DTS-HD 7.1.mkv"
General
Unique ID                                : 84444144661505629638357901537594742388 (0x3F8759C65F64B56329C418D6283E9674)
Complete name                            : g:\Output\Tron Legacy Sample DTS-HD 7.1.mkv
Format                                   : Matroska
Format version                           : Version 4
File size                                : 168 MiB
Duration                                 : 59 s 852 ms
Overall bit rate mode                    : Variable
Overall bit rate                         : 23.6 Mb/s
Frame rate                               : 23.976 FPS
Encoded date                             : 2024-07-25 18:22:15 UTC
Writing application                      : mkvmerge v86.0 ('Winter') 64-bit
Writing library                          : libebml v1.4.5 + libmatroska v1.7.1
Encoding Gui                             : Hybrid 2024.07.24.1

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4.1
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Format settings, GOP                     : M=1, N=12
Format settings, Slice count             : 6 slices per frame
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 59 s 852 ms
Bit rate mode                            : Variable
Bit rate                                 : 23.2 Mb/s
Maximum bit rate                         : 31.0 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.467
Stream size                              : 166 MiB (98%)
Default                                  : Yes
Forced                                   : Yes
Color range                              : Limited
Matrix coefficients                      : BT.709

Audio
ID                                       : 2
Format                                   : Opus
Codec ID                                 : A_OPUS
Duration                                 : 59 s 777 ms
Bit rate                                 : 357 kb/s
Channel(s)                               : 8 channels
Channel layout                           : L R C Ls Rs Lb Rb LFE
Sampling rate                            : 48.0 kHz
Frame rate                               : 50.003 FPS (960 SPF)
Compression mode                         : Lossy
Delay relative to video                  : 6 ms
Stream size                              : 2.54 MiB (2%)
Writing library                          : opusenc from opus-tools 0.2-34-g98f3ddc
Language                                 : English
Default                                  : Yes
Forced                                   : No
Comment                                  : Processed by SoX
ENCODER_OPTIONS                          : --bitrate 512 --comp 10 --framesize 20 --expect-loss 0 --max-delay 1000

Maybe try whether it makes a difference if you use 512 as bitrate.

Cu Selur

[shazzla]

Thanks for the quick reply/test.

An "interesting/funny" fact : the mentioned .mkv plays fine even on a Samsung A25...
Investigating more....

Btw encoding @512 kbps : didnt tried,im on it.

[Selur]

What is the player&co setup that stutters? Does it support opus 7.1?

[shazzla]

SOLVED !

I cant imagine how,but the players audio playback settings were changed. 
Everythings fine now! Banal. Damn.

Selur,many thanks for your efforts!

[Selur]

I'm happy you figured out what was causing the problem.


Cu Selur